Motor boat



July 17, 1928.

H. SCHMITT MOTOR BOAT l Filed March 14, 1927 IIIJ. x IlnHuIllhIh from stem to stern of the boat.

Patented July 17, 122.

SCHMITT, -OF

earner y DETROIT, MIGII'QAN..

Moron BOAT.

Aimplication filed. March 14 rl`his invention relates to a boat construction and particularly to motor boats Vof, the small .or pleasure type. An object of the invention is, by the construction, to increase the' speed and at the same time provide a small light craft which is seaworthy and cheap to manufacture. A further objectis to utilize the lifting power of air to raise 'the craft so that when traveling at highy speeds, only a small portion thereof will be in the water, and to conne the air so utilized to a. certain path or stream, thereby increasing its lift. It is also an object to utilize a portion of theboat deck as an airplane and as a connection between a plurality of hulls, and toutilizc such hulls as engine pits Yfor the housing of engines. Itis a further object to provide a very simple construction affording great strength and providing a boat of' high speed which is noncapsizable and which embodies other new andrusefnl featuresall as hereinafter set forth.

lVith the above land other endsin view, the invention consists in the matters 4herieinafter, set forth and more particularly pointed 'outin the appended claims, reference Abeing had to the accompanying drawing in which Figure l is a plan -view of a boat illustrative of an embodiment of the present invention;V

Fig. 2. 1s a central longitudinal section through the saine; i

Fig. 3 is a transverse section substantially uponV the rline 3X of Fig. l, and

Fig. 4 is a similar cross section 0n the line lx of Fig. l.

The present construction embodies a plurality of long narrow hulls indicated as a whole by the numeral l and a deck 2 which spans the hulls and forms av rigid connection therebetween, said hulls being spaced apart to provide an air passage '3 between the hulls and beneath the deck. This deck between the hulls is planked or covered to provide a smooth under surface 4 which surface serves as an air-plane between the hulls which will act, when the boat is traveling at comparatively high speed, as a lifting plane to receive the impactof the airk and tend to raise the entire boat. This lifting elfect is further increased by confining the air between the adjacent hulls and also by preferably inclining the deck downwardly.`

' As shown this inclination of the deck may be as shown,

', 13,27, Serial No. 17.53155.v

with Yits rear end extending downwardly to approximately the normal water line of the boat, but when in action, the boat will be lifted by the lifting action of thisplane so that the roar end of the deck orplane will be above or adjacent the surface of the water. A longitudinal air passage is thus formed between the two hulls with this passage open at its fore and aft ends, thus confining the air stream laterally, but permite kthe plane of. the keels of the hull. 1 There the inclined plane extends at itsv aft end to al plane belowV the surfaceof the water, the air will; be more or less trapped in the pas sage between the hulls but will -raise-"the boat stern and compressv the water at the stern sutliciently to lallow this air stream to escape. The boat will thus Vride largely on air, and the speedA will be increased thereby` As shown, the twohulls are each formed with substantially vertical `sides formed by two spaced apart planksl 5 extending from bow to .sternv and'curved toward each other to form the pointed bow. These planks thus in eftectforni longitudinal' sills or members upon whichV the engines 6 are supported within the engine pits 7 in the hulls, and the bottom of each hull is formed by planking 8 secured to these sill-s, thus forming substantially flat bottoms for the two hulls. Side planking 9 extends outwardly and upwardly from the sill 5 at the outer side of each hull, and similar planking l0 forms the inner side of each hull above the sill 5, joining at its Lipper edge, the lower surface et of the deck which deck is supported upon a series of ltransverse girders ll which span the spacebetween the hulls and are secured to the sides 9 and l() of the hulls except at the pits 7 and cock pits 12 at the stern ofthe hulls where these girders ll are cut short and Ispan the space between the hulls only, being secured at their ends to the inner wallsl l0 and members 5 to leave the pits open.- A deck plankling 13 is laid upon the girders l1 throughout the length ofthe boat except over the lio pits, and thus the two hulls are connected by a deck structure which is very rigid due to the deck girders extending across both hulls and from side to side of the boat. 'Ihe sides 9 of the hulls may be extended upwardly past the side-s of the deck to form side rails.

14 if desired but due to the inclination of the deck, said deck will be substantially flush with the top of the rails at the bow of the boat. A transverse wall or rail 15 connects the side rails at the stern above the plane of the deck and also closes the stern of each hull. i

Directly forward of each engine pit 7, a tube 16 extends vertically downward through the deck and through eachhull, opening through the bottoms 8 thereof to conduct away any water that may rundown on the deck toward these pits and to provide air vent-s opening through the flat bottoms of the hulls to break the slight vacuum formed beneath the flat bottoms of the hulls as the boat travels forward at high speed. Each tube 16 hasa flange 17 at the rear side of its upper open end to stop the flow of water down the deck and deflect it into said tubes.

Gbviously, changes in construction other than those previously mentioned, may be made Within the scope of the appended claims, without departing from the spirit of the invention, and I do not therefore limit myself to tlie particular construction shown.

What I claim is 1. A `boat includingr a plurality of hulls and a rearwardly and downwardly inclined deck for said hulls rigidly connecting the same and having an under smooth surface forming an air-plane between said hulls when the boat is proceeding forwardly.

2. A boat including a plurality of spaced apart hulls, means rigidly connecting said hulls and spanning the space there-between said means providing a smooth lower surface inclined downwardly fromlbow to stern and with said surface above the water line of the hulls and forming the top of the air open at bow and stern when the boat is being driven forwardly.

Vd. A boat including a pair of spaced apart hulls, and a deck extending across said hulls andv spanning the space between the hulls, the underside of Isaid deck between said hulls being smooth and inclined rearwardly and downwardly with a space between the rear end thereof and theV surface of the water when the boat is ruiming forwardly.

4. A boat including a pair of spaced apart hulls having substantially, longitudinally straight adjacent sides forming an air passage therebetween open at bow ,and stern,

V4passage between the hulls with said passage Y and means rigidly connecting said hulls, and

closing theupper side of said air passage, said means having a smooth under surface .inclined rearwardly and downwardly with a vspace between the rear vend thereof and the surface of the water when the boat is running.

5. A power boat including a pair of hulls, each affording an engine pit, a deck rigidly connecting said hulls and extending across and closing said hulls and spanning the space therebetween, said deck having smooth under surface between said hull-s and inclined from bow to stern with a space be tween the stern of saidsurface and the water surface when the boatis running.

(i. AVV power boat including a pair of hulls spaced apart and having substantially straight parallel sides,v and a deck extending acrossboth hulls and across said space, said deck extending froinbow to stern of the boat and inclined from the bow downwardly toward the stern to above the water line of theboat when in forward motion.

In testimony whereof I aliix my signature.

HENRY scHMiT'r. 

